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From:   guoren@kernel.org
To:     guoren@kernel.org, palmer@rivosinc.com, paul.walmsley@sifive.com,
        falcon@tinylab.org, bjorn@kernel.org, conor.dooley@microchip.com
Cc:     linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-riscv@lists.infradead.org, stable@vger.kernel.org,
        Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V2 2/2] riscv: stack: Fixup independent softirq stack for CONFIG_FRAME_POINTER=n
Date:   Sat, 15 Jul 2023 20:15:06 -0400
Message-Id: <20230716001506.3506041-3-guoren@kernel.org>
In-Reply-To: <20230716001506.3506041-1-guoren@kernel.org>
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From: Guo Ren <guoren@linux.alibaba.com>

The independent softirq stack uses s0 to save & restore sp, but s0 would
be corrupted when CONFIG_FRAME_POINTER=n. So add s0 in the clobber list
to fix the problem.

Fixes: dd69d07a5a6c ("riscv: stack: Support HAVE_SOFTIRQ_ON_OWN_STACK")
Cc: stable@vger.kernel.org
Reported-by: Zhangjin Wu <falcon@tinylab.org>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/kernel/irq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index d0577cc6a081..a8efa053c4a5 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -84,6 +84,9 @@ void do_softirq_own_stack(void)
 		: [sp] "r" (sp)
 		: "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7",
 		  "t0", "t1", "t2", "t3", "t4", "t5", "t6",
+#ifndef CONFIG_FRAME_POINTER
+		  "s0",
+#endif
 		  "memory");
 	} else
 #endif
-- 
2.36.1